Gearing.



R. MILNE. GEARING.

. APPLICATION FILED APR.25, 1908. 968,488, Patented Aug. 23, 1910.

' zsHEBTs-SHEET 1.

Il l! mmm"Mmmm INH.

f'iilllllf E' www . R. MILNE.

GEARING. APPLICATION FILED APR.Z5, 1908.

Patented Aug. 23, 1910.

' '2 SHEETS-SHEET z.

1 rm U I gli Z 5 lll.

Minivan mmlmmuu umm INI MTW

UNITED sra'rns PATENT orme-n ROBERT MILNE, OF ROCKFORD, ILLINOIS, ASSIGNOR TO ROCKFORD DRILLING MACHINE COMPANY, 0F ROCKFORD, ILLINOIS, A CORPORATION 0F ILLINOIS.

GEARING".

Speccation of Letters Patent. Patented Aug, 23, 1910 v Application led April 25, 1908. Serial No. 429,256.

T o all whom it may concern: A

Be it known that I, ROBERT MILNE, a citizen of the United-States, and a resident of Rockford, in the county of vWinnebago and State of Illinois, have invented certain new and useful Improvements in Gearing, of which the following is a specification.

The gearing of this invention is intended, more particularly, for use in connection with drilling machinery, although its use is not restricted to such machines.

The object of the present invention is to obviate the necessity for using bevel gearing and substitute therefor spur gearing, which is a more satisfactory form of gearing in that it does not involve change in the direction in which the shafting is mounted, so that a much simpler and more compact arrangement of the parts is aorded.

The invention furthermore relates to a mounting for the gearing, whereby the train of gears can be thrown out of mesh by suitable" mechanism at the proper point in the advance of the drill spindle.

The invention consists in the features of construction and combination of parts hereinafter described and claimed.

In the drawings, Figure 1 is a side elevation of the gearing mechanism in mesh; Fig. 2 a similar view, showing the worm thrown out of mesh; Fig. 3 a front elevation of the mechanism; and Fig. a a top or plan view of the same.

As illustrated in the drawings, the positive feed mechanism is shown in a form adapted to be applied to a drilling machine of standard type which employs the usual rack and pinion method for advancing the drill. This class of machinery is so well known that it is deemed necessary to illustrate only such parts thereof as are primarily involved in the mechanism of the present invention.

The mechanism of the present invention is actuated from the main shaft i5 of the drilling machine, which actuates the usual crown gear wheel of the drill spindle, not shown. rIhe shaft 5 is provided with a spur gear 6, which in turn meshes with a spur gear slidably mounted on a stub worm shaft 8, and which is adapted to be thrown out of mesh with the spur gear 6 by the action of a clutch yoke -9 which engages a grooved clutch collar 10 of the usual character. The

clutch yoke 9 is mounted on an actuating rod 11 which is adapted to be moved to suitable positions to bring the slidably mounted spur gear 7 into and out of mesh with the spur gear 6. The shaft 8 is journaled within a sleeve 12 and terminates at its forward end in a worm 13, shown in Fig. t, which worm is partially inclosed by a housing 14, which housing is provided on its forward side with a circular chamber 15, within which is located a worm gear 16 on the upper end of a vertical power transmission shaft 17. The power transmission shaft is journaled, at its upper end, within a bearing collar 18, which is integrally formed, with the circular chamber of the housing, and immediately below the bearing collar are located a plurality of power transmitting gear wheels 19, of different sizes, which mesh with companion power receiving gear wheels 20, any pair of which can be suitably adjusted to coperatc with one another. A collar 37 vcarries a key or spline adapted to key any one of the gears 19 to the shaft 17, depending upon the position of the collar 87. I-Iowever, I do not concern myself in this invention with the detail construction of the collar 37 and the spline or key attached thereto for keying any one of the gears 19 to the shaft 17, inasmuch as this construction is old and well known in the art.

The powerl receiving gear cated upon a vertical worm shaft 21 which is journaled within a vertical journal sleeve 22 provided, near its upper end, with a rearwardly extending arm 23, which is pivotally mounted upon a cross pin 24, which arrangement permits the sleeve and the shaft carried thereby to be swung upon the pin 24C as an axis. The shaft 21 is provided, at its lower end, with a worm 25; which meshes with a worm wheel 26 mounted upon the outer end of a horizontal shaft 27, which carries the usual pinion, not shown, for engaging the rack mechanism employed to advance with the drill spindle. The shaft 27 is journaled between rigidly mounted outer and inner arms 28 and 29 respectively, the former of which is provided, at its upper end, with a short collar 80, and the latter of which is provided with an elongated collar 81, best shown in Fig. 3. Intermediate the two collars, which are rigid with the pin wheels are lo- 24, is interposed a sleeve 32, formed on the I nd of the arm 23, which sleeve serves as a journal mounting for said arm. The sleeve l2, which carries the stub shaft 8, is supported by rear standards 33 and 34 and a forward standard 35, which standards spring from the sleeve 3l, from which the arm 29 depends.

The method whereby the power is transi mitted will be fully understood from the foregoing description.

lVith the parts in the position indicated in Fig. l, rotation will be imparted to the horizontal shaft 27 by the mesh of the teeth on the worm 25 with the teeth on the gear wheel 26. By slightly swinging the sleeve 2l, which movement can be imparted by any suitable mechanism, the worm will be disengaged from the worm gear wheel, and the feeding operation will cease. By reason of the point at which the sleeve 22 is pivoted, which is a considerable distance from the worm, a very slight movement will be suliicient to disengage the worm gearing. 1e mechanism is extremely compact in view of the fact that the shafts 17 and 2l eXtend in parallel relation and in close proximity to one another, which arrangement permits of the employment of a plurality of gears of different ratios, whereby changes in the rate of feeding' speed can be readily made.

The means whereby any selected pair of gears may be rigidly held on their respective shafts are not shown, but this result can be accomplished 1n any usual and well known manner.

What I claim as new and desire to secure by Letters Patent is:

In gearing, the combination of a power transmission shaft, a power transmission gear wheel thereon, a worm shaft, a power receiving gear wheel thereon, a pivoted bearing for the worm shaft, a worm on the worm shaft, a worm wheel adapted. to mesh with said worm when swung into operative position, a worm wheel on the power transmission shaft, a worm meshing with said worm wheel, a stub shaft upon which the worm is mounted, a spur gear on the stub shaft, a main driving shaft, and a spur gear thereon meshing with the spur gear on the stub shaft, substantially as described.

2. In combination with a main driving shaft and a pinion shaft, gearing comprising a stub shaft, a spur gear thereon, a spur gear on the main shaft meshing with the first mentioned spur gear, a worm on the stub shaft, a worm wheel in mesh with said worm, a power transmission shaft upon which the worm wheel is mounted, a power transmitting spur gear on the transmission shaft, a worm shaft, a. power receiving spur gear thereon, a journal sleeve for the worm shaft, a pivotal mounting for the journal sleeve, a worm on the worm shaft, and a worm wheel on the pinion shaft adapted to be actuated by the worm when swung into meshing position, substantially as described.

ROBERT MILNE. 

